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Home >> Honda >> 2013 >> CR-Z Base, Automatic CVT Trans >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> PGM-FI System >> DTC Troubleshooting >> DTC P0135: A/F Sensor (Sensor 1) Heater Circuit Malfunction

DTC P0135: A/F Sensor (Sensor 1) Heater Circuit Malfunction

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3, 000 RPM without load (CVT in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
  4. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0135 indicated? 

    YES  -Go to step  5.

    NO  -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay, and the ECM/PCM.

  5. Turn the ignition switch to LOCK (0).
  6. Check the No. B26 A/F SENSOR (10A) fuse in the under-dash fuse/relay box.

    Is the fuse OK? 

    YES  -Go to step  7.

    NO  -Go to step  20.

  7. Open the fuse lid panel (A), then remove the A/F sensor relay (B) from the under-dash fuse/relay box.
    Fig 1: Identifying Fuse Lid Panel And A/F Sensor Relay
    G06949810Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Test the A/F sensor relay (see POWER RELAY TEST ).

    Is the A/F sensor relay OK? 

    YES  -Go to step  9.

    NO  -Replace the A/F sensor relay, then go to step  24.

  9. Disconnect the A/F sensor (Sensor 1) 4P connector.
  10. At the sensor side, measure the resistance between A/F sensor (Sensor 1) 4P connector terminals No. 3 and No. 4.
    Fig 2: Measuring Resistance Between A/F Sensor (Sensor 1) 4P Connector Terminals No. 3 And No. 4
    G06949811Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 1.9-2.7 Ω at room temperature (65-70°F, 18-21°C)? 

    YES  -Go to step  11.

    NO  -Go to step  23.

  11. At the sensor side, check for continuity between A/F sensor (Sensor 1) 4P connector terminals No. 1 and No. 3, and between terminals No. 1 and No. 4 individually.
    Fig 3: Checking Continuity Between A/F Sensor (Sensor 1) 4P Connector Terminals No. 1 And No. 3, And Between Terminals No. 1 And No. 4
    G06949812Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  23.

    NO  -Go to step  12.

  12. Jump the SCS line with the HDS.
  13. Disconnect ECM/PCM connector C (44P).
  14. Check for continuity between ECM/PCM connector terminal C9 and A/F sensor (Sensor 1) 4P connector terminal No. 4.
    Fig 4: Checking Continuity Between ECM/PCM Connector Terminal C9 And A/F Sensor (Sensor 1) 4P Connector Terminal No. 4
    G06949813Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  15.

    NO  -Repair an open in the wire between the ECM/PCM (C9) and the A/F sensor (Sensor 1), then go to step  24.

  15. Connect A/F sensor (Sensor 1) 4P connector terminal No. 3 to body ground with a jumper wire.
    Fig 5: Connecting A/F Sensor (Sensor 1) 4P Connector Terminal No. 3 To Body Ground With Jumper Wire
    G06949814Courtesy of AMERICAN HONDA MOTOR CO., INC.
  16. Check for continuity between A/F sensor relay 4P connector terminal No. 1 and body ground.
    Fig 6: Checking Continuity Between A/F Sensor Relay 4P Connector Terminal No. 1 And Body Ground
    G06949815Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  17.

    NO  -Repair an open in the wire between the A/F sensor (Sensor 1) and the A/F sensor relay, then go to step  24.

  17. Disconnect ECM/PCM connector A (44P).
  18. Connect ECM/PCM connector terminal A21 to body ground with a jumper wire.
    Fig 7: Connecting ECM/PCM Connector Terminal A21 To Body Ground With Jumper Wire
    G06949816Courtesy of AMERICAN HONDA MOTOR CO., INC.
  19. Check for continuity between A/F sensor relay 4P connector terminal No. 4 and body ground.
    Fig 8: Checking Continuity Between A/F Sensor Relay 4P Connector Terminal No. 4 And Body Ground
    G06949817Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  30.

    NO  -Repair an open in the wire between the ECM/PCM (A21) and the A/F sensor relay, then go to step  24.

  20. Open the fuse access panel (A), then remove the A/F sensor relay (B) from the under-dash fuse/relay box.
    Fig 9: Identifying Fuse Access Panel And A/F Sensor Relay
    G06949818Courtesy of AMERICAN HONDA MOTOR CO., INC.
  21. Disconnect the A/F sensor (Sensor 1) 4P connector and the EVAP canister vent shut valve 2P connector.
  22. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 3 and body ground.
    Fig 10: Checking Continuity Between A/F Sensor (Sensor 1) 4P Connector Terminal No. 3 And Body Ground
    G06949819Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the A/F sensor relay, the A/F sensor (Sensor 1), and the EVAP canister vent shut valve. Also replace the No. B26 A/F SENSOR (10 A) fuse, then go to step  24.

    NO  -Replace the under-dash fuse/relay box, then go to step  24.

  23. Replace the A/F sensor (Sensor 1) (see A/F SENSOR REPLACEMENT  ).
  24. Reconnect ail connectors.
  25. Turn the ignition switch to ON (II).
  26. Reset the ECM/PCM with the HDS.
  27. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  28. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0135 indicated? 

    YES  -Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay, and the ECM/PCM, then go to step  1.

    NO  -Go to step  29.

  29. Monitor the OBD STATUS for DTC P0135 in the DTCs MENU with the HDS.

    Does the HDS indicate PASSED? 

    YES  -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step  28, go to the indicated DTC'S TROUBLESHOOTING .

    NO  -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay, and the ECM/PCM, then go to step  1. If the HDS indicates NOT COMPLETED, go to step  27.

  30. Reconnect all connectors.
  31. Update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE  ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
  32. Start the engine.
  33. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0135 indicated? 

    YES  -Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  32. If the ECM/PCM was substituted, go to step  1.

    NO  -Go to step  34.

  34. Monitor the OBD STATUS for DTC P0135 in the DTCs MENU with the HDS.

    Does the HDS indicate PASSED? 

    YES  -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT  ). If any other Pending or Confirmed DTCs were indicated in step  33, go to the indicated DTC'S TROUBLESHOOTING .

    NO  -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  32. If the ECM/PCM was substituted, go to step  1. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

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